In the standard flame-resistant optical fiber cable for mine use, the fibers are positioned in a loose tube made of high modulus plastic. The tubes are filled with water-resistant filling compound. are filled with water proof nonwoven fabrics of high density.

A steel wire, sometimes sheathed with polythene for cable with high fiber count, locates in the center of core as a metallic strengthening member. Tubes are stranded around the strengthening member into a compact and circular cable core. The PSP is longitudinally applied over the cable core which is filled with the filling compound to protect it from water ingress. Then a PE sheath is applied.At last, the cable is completed with a blue PVC sheath.